Atherton: The House of Power

The world of Atherton consists of three distinct, interconnected lands stacked atop each other like a layer cake, At the top are the Highlands, home to Atherton's rich and oppressive ruling class; the middle layer is the Flatlands, populated by Atherton's subservient working class; the bottom layer is The Wastelands, where none dare venture, for the few that have done so have never been heard from again. Edgar, an eleven-year-old orphan, finds a book that reveals significant
secrets about Atherton, the strictly divided world on which he lives,
even as geological changes threaten to shift the power structure that
allows an elite few to live off the labor of others.